Fix alpha overflow when converting from RGBA64 to RGBA.

Fixes converting the sample from ticket #503 to 32bit RGB.

Fix alpha overflow when converting from RGBA64 to RGBA.
Fixes converting the sample from ticket #503 to 32bit RGB.
4a9f466b · Michael Niedermayer · Carl Eugen Hoyos · 409a3bda · 4a9f466b
Commit 4a9f466b authored Mar 04, 2012 by Michael Niedermayer Committed by Carl Eugen Hoyos Mar 04, 2012
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output.c libswscale/output.c +2 -2

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--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -1040,8 +1040,8 @@ yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
                       *b =  c->table_bU[U + YUVRGB_TABLE_HEADROOM];

            if (hasAlpha) {
-                A1 = (abuf0[i * 2    ] + 64) >> 7;
-                A2 = (abuf0[i * 2 + 1] + 64) >> 7;
+                A1 = abuf0[i * 2    ] * 255 + 16384 >> 15;
+                A2 = abuf0[i * 2 + 1] * 255 + 16384 >> 15;
            }

            yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,